Steam-engine reversing-gear



0. W. YOUNG.

STEAM ENGINE REVERSING GEAR.

APPLICATION TILED SEPT. 7. 19164 Patented Jan. 11,1921.

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STEAM ENGINE REVERSING GEAR.

APPLICATION FILED SEPT. 7. I916- 1,364:,910. Patenwd Jan. 11, 1921.

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STEAM ENGINE REVERSING GEAR.

APPLICATION FILED SEPT. 7, I9I6.

Patented Jan. 11, 1921.

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STEAM ENGINE REVERSING GEAR.

APPLICATION FILED SEPT. 7. I916.

Patented Jan. 11, 1921.

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STEAM ENGINE REVERSING GEAR.

APPLICATION FILED SEPT. 7, 1916.

1,364,910. Patented Jan. 11,1921.

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OTIS W. YOUNG, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE PYLEQN'ATIONAL COM- PANY, OF OHIGAGO,'ILLINOIS, A CORPORATION OF NEW JERSEY.

, Specification of Letters Patent.

Patented J an. 11, 1921.

Original application filed October 2 1914, Serial No. 864,552. Patent No. 1221,947. Divided and this application filed September 7, 1916. Serial No. 118,816.

To all whom it may concern:

Be it known that I, OTIS W. YOUNG, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois have-invented a certain, new and useful lmprovement in Steam-Engine Reversing-Gears, of which the following is a specification.

This is a division of my application, Serial No. 864,552, filed October 2, 1914, for locomotive valve gears.

My invention relates primarily to reversing gears for steam engines and has particular reference to a gear for use with the well known. type of railroad locomotive. My reversing gear is intended primarily for use in connection with the valve gear described and claimed'in my co-pending application No. 864,552 of which this application is a division, but.,o-f"c0urse it is obvious that my reversing gear might be used in connection with other types of engines or in connection with other types of valve gears.

One object of my invention is to provide a reversing gear and mechanism which will be easy to operate. Another object is to provide such reversing mechanism which will be independent of changes in the engine, that is to say, one object is to provide a reversing gear which can be set by the operator at the beginning of a run, with full confidence that no change in the temperature of the engine, frame or other parts, and no irregularity or roughness inthe road bed or variation in the load drawn by the engine will change the setting of the valve reversing gear. Thus, in using my reversing gear the engineer knows that when he sets his gear for a particular cut-off or arranges his reversing mechanism so that the cycle of engine operation will follow any particular course, it will always follow that course until he himself makes a change. Still other objects of my invention will appear from time to the discussion proceeds.

My invention is illustrated more or less time as Fig. 2 is a plan view of the valve gear with the valves of the two engines of the locomot1ve in part section and with parts cut away;

Fig. 3 is a side elevation on arienlarged scale of the valve gear'in a difierent position from Fig. 1, the parts shown in the upper right-hand corner separate being the corresponding parts on the far side, the remainder of the view showing the parts on the near side to indicate the relative position part section of a reversing screw and sleeve Fig. 7 is a section on the line 7--7 of Fig. 4; Fig. 8 is a'section on the line 88 of Fig. 6;

Fig. 9 is a section on the line 99 of Fig. 5;

ig. 10 is a detail section of part of the reversing screw and nut;

Fig. 11 is a section on line 11--11 of Fig. 6;

Fig. 12'is a detail, partly sectional, section bemg made on the line 12-12 of Fig. 1';

Fig. 13- is a diagrammatic detail showing my reversing gear. applied to the ordinary type of VValschaert valve gear;

Fig. 14 is a detail part section on an enlarged scale showin a portion of thereversing gear shown in %ig. 11.

Like parts are indicated by like letters throughout the several figures.

Since my invention is primarily applicable to a locomotive, I have illustrated it diagrammatically as so applied and have shown in Fig. 1- enough of the locomotive frame and supporting mechanism to indicate enerally the location of my valve gear an its relation to the locomotive parts of the ordinary type. i

A is a locomotive driver and there may be only one or there may be a number of them.

A is the usual type of locomotive frames A is the journal blockwhich contamsthe drive wheel axle and is mounted in the frame. A is a saddle on the locomotive 5 frame fixed in position upon each individual locomotivebut likely to be found in different positions in different types anddesigns of locomotives. A is a hanger or cross frame extending across between the two side frames of the locomotive to tie them together andgalso to provide a support for the cross head guide A. A? isan'engine cylinder supported on the engine frame in any suitable, manner. nowhere specifieall indicated, In ,it reeiprocates the piston having the p istorr rod A which passesthrough the usual type of stufiing box A in the eylin d head. A)" and drives a cross headA which reciprocates on. the cross head guide Al is a steani chest containing an inside admission -.piston valve A which controlsthe, usualsteam ports and passages as indicated. A?! is a. valve rod and A a valve rod cross head slidable. alonga cross head guideflA This guide ismounted on anarln 1 projecting from the cover of the steam chest-A Bis a frame or support for the movable members of the valve gear mechanism mounted at its forward end. on. the cross frame A? and supported at its rear end by the extension L-piece B which rests upon the saddle At The frame, it will be noted, is substantially UFshapedbeing madeup of two substantially. parallel-side members B B tied together at the rear end to form a U andhavingan extension B .to which is attached the L member B On the lefthand side,. of;the locomotive frame is a similar support for the valve gear movable mem bers made. up of, side pieces B, B- tied together at their rear end andprovided with the rearwardextension B connected to the L pieces B which also rests upon the saddle A onthe locomotive frame tying the two L piecesB B together to holdthe two separate valve,- gear frames or supports inparallelism.

C, C are combined lap and lead lever segmental slotted reversing and cut-ofi' varying links having trunnions C and rotatably mounted one in each of the valve gear. frames adjacent the rearends thereof. These reversing links are each of; them provided with a downwardly depending extension C? whichextension while notintegra]. with the link is after assembly rigidl mounted thereon. C, C are floating lin s pivoted at, one end to the extension on the reversing. link and at the. other end to the-cross head pin C so that as the piston of each engine travels back and forth the reversing link will be rocked in unison with said movement. It will, of course, be possible to attach the floating link to the cross head by any other suitable means but for mounted at its other end on the shaft l) adjacent the bearing D D is a lever mounted upon the right-hand. end of the shaft 1) and D is a lever mounted on the right hand end of. the shaft D. D is a lever mountedon the left hand; end of the shaft- D and. D is a lever mounted on the left hand end of the shaft D D is a floating lapand lead lever mounted pivotally upon thev lever D connected at itslower end by means of the link D with the valve stem cross head A D is a floating lap and lead leverpivotally mounted on the lever D connected at its lower end pivotally by. means of the link D with a similar valve stemcross head A.

E is a reach. rod connecting the upper ends. respectively of the reversing link C, and the lap. and lead lever D E is a similar reach rod connecting the upper ends of the reversible link C and the lap and lead lever D1 sothat, a rocking of the reversing link will result in a rocking of the lap and leadlever. Pivotally mounted-onthe lever D is a radius bar E This radius bar is forked at its rear end as indicated at E to furnish; a bearing for the pins E which project outwardly on either side from the link block E which block is slidable in the reversing'link. A similar construction appears on the left hand side of the engine wherein a radius bar E is pivoted on the arm D forked at E and pivoted to a similar sliding link block in the reversing lin'k C F is a reversing shaft rotatably mounted at one endin the member 7 and rotatably mounted at the other end on a stub reverse shaft F which stub is itself rotatable in the member B F is a reversing arm' rigidly mounted on the. left hand end of the reverse shaft F pivotally engaging the block I which block is slidable in the slot F in the radius barE. F isan arm rigidly mounted onthe stub reverse shaft F pivotally engaging ablock Ff. which block is slidably mounted in the slot- F in the radius bar F is a short reverse arm mounted on the shaft F at approximately 45 below. the plane of the arms F andF". F is a short reverse arm mounted on the shaftF at approximately 45" above the plane of the arms F and F, F, F are bearin brackets mounted on the member 13. idable in them is a reversing sleeve, F rovided above and below with bosses F upon which are pivoted connecting links F F pivoted at their other ends respectively on the arms F F 8 so that a longitudinal movement of the sleeve F will result in rocking the arms F F9 toward or from each other as the case may be and similarly rocking the armsF F G is a bracket mounted onthe member B behind and removed from the bracket F Through it passes the screw stem G On either side of it are ball bearin s G G held in position upon the stem 1 by lock nuts G The stem G terminates in a screw G located within the sleeve F. G is a packing box at one end of the sleeve F G is an oil tight plug at the other end. G is a cylindrical reversing nut mounted in the sleeve F and held against the shoulderGr by a sleeve G forced into position by the plug G". This nut is held against rotation by a lock nut G; G is an oil hole through the sleeves F and G". G is a slot in the bottom of the nut G to permit circulation of the oil throughout the entire length of the sleeve F.

H. is a universal joint on the rear end of the stem i mounted at one end on the universal joint H and rotatably mounted at the other in a split bearing H The two parts of the split hearing are adapted to be clamped together against the enlargement H on the shaft H by means of a cam lever H having a cam shoulder H pivoted at one end on the lower portion of the bearing the shoulder being adapted to engage the cam surface H. The block H is pivotally mounted as indicated on a plug H adapted to bescrew-threaded into the side of the boiler H. H" is an operating hand Wheel whereby the operator may manipulate the reversing mechanism.

I is a slot through the shaft H adjacent its lower end. I is a hollow annular carriage slidable upon shaft H I is a connecting link pivotedon said carriage at one end and at the other end on the sleeve F. l is an indicator rod located in the control rod H 1* is a cross piece slidable in the slot I engaging the interior of the carriage I mounted at the lower end of the indicator 1. I is a scale engraved on the end of the indicator armrwhere it passes through the sleeve or-nut I marked as indicated to show the position of the reversing gear. In the modified form shown in Figs. 1.3 and 14', I apply a portion of my reversing mechanism to the ordinary well-. own type of Walschaert. valve gearwherein L is the steam cylinder, L the valve steam chest, L the engine cross-head, L the Valve stem crosshead, L the combination lever, L" a H is a hollow control rod driving link connection therefrom to the versing shaft M The reversing shaft M carries a lever M pivoted on a block M which block is slidable on the extension M on the radius rod L; M is a controlling lever on the reversing shaft M, M a link leading therefrom and pivotally attached at its other end to the lug M in the block M screw-threaded in the end of the reversing sleeve M, which sleeve is adapted to be moved back and forth in the same manner as previously indicated in my preferred form by means of a screw M The use and operation of my invention are as follows:

It must first be'understood that the valve movement for the two engines of the locomotive is obtained entirely from the piston movement of those two engines. The eculiarities of lap and lead in valve trave are, of course, well known and need no particular discussion at this time. Sufiice it to say, that it is necessary to have two separate sources of ower in order toprovide the proper lap and lead and valve travel movement. In my arrangement, I make the reciprocation of the piston of each engine give the lap and lead movement for its own valve and at the same time give the valve travel movement for the valve of the other engine. Thus it is necessary to connect across between the two engines by any suitable means such as the two rock shafts shown.

Referring first to the drawings, when the piston reciprocates it will cause the reversing link to rock back and forth. The rocking of this link will cause the floating-lap and lead lever to reciprocate, and assuming for the instant that the lever which supports the floating lap and'lead lever is fixed, the only movement given to the engine valve on the right hand side will be the lap and lead movement caused by the rocking of the lap and lead lever. This movement is a very slight movement as may be seen by the ar rangement of the lever. e haveassumed that the lever on the interlocking shaft uponv sion will cause su cient power to operate lessens its difficulty to manipulate.

block is at the center of the other, and that the operation of the other engine is the same so that in the central position the engine will run in either direction according to which direction it happens to have-started, but its power will be slight, on account of the steam port opening being equal only to the lead, its maximum opening occurring at each dead center of the driving wheels. Immediately the wheel center is passed, the steam opening commences to close and cut off access before there is an appreciable movement of the piston, but the'clearance space between the piston and valve will con tain steam at high ressure, and its expanthe engine.

Referring now to Fig. 2, we see that the reversing gear has been manipulated to bring the block near the upper end of-the slot in the reversing link. The engine on the other side will similarly have the block near the bottom of the reversing link, as it will be noted that the reversing mechanism is such that when one bar goes up the other goes down, In double cylinder engines the main rod connection to the driving wheels is in effect a crank on each end of the driving axle, one'crank 90 in advance. of the other. Consequently one engine, usually the right engine may be said to lead the other 90. If, however, we should consider the left hand engine as leading, its lead would then be 27 0 instead of 90. For this reason a valve deriving its entire movement from the reciprocation of the pistons must be arranged for valve travel producing mechanism direct on one side and indirect on the other. This is the reason for causing one radius bar to go up when the other goes down. Instead of being a disadvantage, this is a decided advantage inasmuch as it causes a balanced gear and materially Now with the engine moving, the reciprocation of the crosshead will result in a rocking of the reversing lever and this rocking of the reversing lever will result in a rocking of the floating lap and lead lever andth'us the valve on the right hand side will be given this lap and-lead movement owing to the rocking of the right hand reversing lever and the same will be true of the valve on the left hand side owing to the rocking of the left hand reversing lever. But now that the two blocks are moved away from the center of the reversing levers, the radius. bars will commence to reciprocate and the reciprocation of the radius bar will tend to rock the two interlaced shafts which extend across the engine. As shown in Fig. 3, the rocking of the radius bar on the rlght hand side will result in a rocking of the lever which supports the lap and lead lever on the other side, that is to say, for the left on the other side.

The foregoing detailed description of the parts, itis thought, brings out clearly enough, the operation of the valveactuating structure. The reversing gear, so-called,

which is the primary subject matter of the divisional application, is that part of the total valve gear which raises and lowers the radlus bars E so that the movement imparted to the different valve controlling parts by the reversing link may be controlled. It is understood, of course, that when the radius bar is attached to thereversing link on one side of the pivot line of the link, forward movement of the engine will take place.' When it is on the other side reverse movement will take place and it is also understood that the distance between the center of rotation of the reversing link and the connecting point of the radius bar on the link controls the amount of movement of the valve parts. At the central position there is no movement. At the extreme up or down positions there is a maximum reverse or forward movement as the case may be.

In the form of valve gear in connection with which I have illustrated my invention, the parts are so arranged that it is desirable to have one radius bar go up while the other goes down and vice versa, thus balancing the weight of the parts and also balancmg any resistance to movement by them such as may be caused by the work which they are doing.

The reversing shaft it will be noted is made u of two parts, one short, the other long. ach of them has at each end a lever. The outside levers when rocked tend to raise or lower, as the case may be, the radius bar, because these levers are pivoted on the block which is slidable in the slot in the radius bar. The slot being longer than the block permits the arms to rock without binding and also permits the radius bar to reciprocate without interference from these arms. The two shorter arms adjacent the inner ends of the two parts of the 'rock It will be'noted that the reversing mechanism is mounted upon the valve mechanism frame so that when expansion takes place in the boiler, no effect will be had in the reversing mechanism, because the only thing that affects the reversing mechanism is the rotation of the screw in the reversing housing, which since that screw is fixed 1n pos1- tion on the gear frame moves the reversing sleeve back and forth. Any expansion in the engine resulting in a change in the length of the rod or control leading uptothe engine cab canhave no effect because the end of that rod is free to slide back and forth in the supporton the other boiler.

In order that the engineer may know just where his reversing mechanism is placed,. that is to say, whether his engine is set for reverse or for forward or in a particular cutofi', an indicator must be provided. This indicator takes the form of a graduated or marked rod which projects out from the end of the controlling shaft through the hand wheel. This shaft or rod moves back and forth in response to the movement of the reversing sleeve because of the connection through the link from the reversing sleeve to the carriage slidable on that hollow shaft. This carriage, of course, is located on the shaft where the shaft is slotted, and being hollow, the pin on each slide through the slot from the indicator bar is engaged by the carriage and moved back and forth by it so as to give the operator at all times a fixed indication of where his engine is.

The block in the reversing link is integralwith the pins projecting from it and these pins are themselves rotatably mounted in the bearings in the forked ends of the radius bar. These bearings can be made as long as necessarywithout effect upon the weight of the block itself or the weight of the reversing link.

lllhe bearing for-the upper end of the reverse control rod is, as it will be noted, screw-threaded in the wall of the firebox or boiler and the rod isslidable and rotatable in that bearing. In order to prevent rotation of the rod after the engine has been set at a certain point, the quick active cam lever device is applied to draw together the two split parts of the bearing and lock the rod against rotation. The reversing screw, it will be noted, isinclosed within a dustproof oil container or receptacle so that it is not exposed to wear and abrasion by the grit and dirt of the road, and as the screw moves back and forth in the nut therein. contained, it is lubricated by the oil con tained' within the housing.

I have used the term control as applied to the hand wheel and associated parts at the operators station. This hand wheel does not change position but merely rotates and the operator by rotating it does control the operation .of the reversing gear. I have also used the term transmission mechanism and that refers to. those parts which located adjacent the reversing gear operate to move the reversing gear parts to position them and cause them to control the operation of the engine. Specifically, the sliding sleeve which carrie's the two toggle links which rock the reversing levers, the nut inside the sleeve, the short stub shaft screw-threaded in the nut and held against longitudinal movement while free to rotate all form part of the transmission mechanism. The term connecting rod applies to the hollow shaft extending from the control wheel to the stub screw-threaded shaft and connected to it by the universal joint as shown.

I claim 1. A reverse mechanism for engine valve gears, comprising a control at the operators station, a transmission mechanism associated with and connected to the reversing device and a rotatable connecting rod from the control to the transmission mechanism.

2. A reverse mechanism for engine valve gears, comprising a control at the operators station, a transmission mechanism associated with and connected to the reversing device and a connecting rod from the control to the transmission mechanism, said mechanism containing a part adapted to be rotated by the rod and anchored against longitudinal motion. 7

3. A reverse mechanism for engine valve gears, comprising a control at the operators station, a transmission mechanism associated with and connected to the reversing device and a connecting rod from the control to the transmission mechanism, said mechanism containing a part adapted to be rotated by the rod and anchored against longitudinal motion, together with a nonrotating part longitudinally movable in response to the movement of such rotating part.

4. A reverse mechanism for multiple engine valve gears comprising a control, a

connecting rod, a transmisslon device mounted as a unit with the valve gear, and connections from the transmission device to the valve-reversing devices .whereby the latter are simultaneously moved in opposite directions. I 5. In a valve gear for a plurality of engines, the combination of reverse shafts concentrically mounted and provided with independent, operating arms, a reverse screw mounted radial to said shafts, a nut engaging said screw, connections between said arms and said nut, and means for minutely adjusting said screw.

6. In a valve gear for'a plurality of engines, the combination of reverse shafts concentrically mounted and provided with independent, operating arms, a reverse screw mounted radial to said shafts, a nut engaging said screw, connections between sa1d arms and said nut, and means for minutely adjusting said screw, the arms connected to said nut being on opposite sides thereof and arranged to rotate the shafts in opposite directions in response to the longitudinal movement of the nut.

7. In a valve gear for a. plurality of en- ,gines, the combination of reverse shafts concentrically mounted and provided with independent, operating arms, a reverse screw mounted radial to said shafts, a nut engaging said screw, mountedradial to said shafts, a "nut en aging said screw, connections' between sa1d arms and said nut, and means for minutely adjusting said screw, the arms connected to said nut being on opposite sides thereof and arranged to rotate the shafts in opposite directions in response to {the longitudinal movement of the nut, a supporting member upon which said shafts and screw are together mounted as a unit.

9. In a steam engine valve reversing gear, a pair of operating links, mounted for relative angular motion, a reversing screw and means for rotating it, a nut in engagement with the screw and mounted for lateral movement only, and a .pair of toggle arms, each of said arms being pivoted on the nut. and on. the end of one of the-reversing links whereby rotation ofthe screw will be transmitted through .the nut and toggle arms to cause angular movement of the reversin links.

10. n a steam engine valve reversing gear, the combination of a reversing screw, a nut engaging said screw, an extension to said nut, said extension encircling said screw and forming a dust-proof inclosure for the working parts of the screw and the nut.

11. Ina steam engine valve reversing gear, a reversing screw, a nut engaging said screw, a hollow extension to said nut, said hollow extension having one closed end and-one packed end and a smooth shank in continuation of the screw passing out 'throu h the packed end.

12. 11 asteam .engine walve reversing gear, a transmission mechanism mounted as a'unit withthe gear, a control at the openators station, a connecting rod from the support forthe rod at a point removed from.

the screw comprising a supporting stud, a

1 block pivotally mounted on the stud and adapted to engage and hold the rod.

14. The combination with a reversing a gear of a reversing screw, a rod extending from and adapted to operate;the screw, a support for the 'rod fat a point removed from the screw comprising a supportin stud, a block'pivota'lly mounted on the stu and adapted to engage and hold the 10d,

and means pivoted 'on the stud dor clamping the split portions on the rod.

15. In a valve reversing gear, a reversing screw and a-nut screw-threaded thereon and mounted for lateral movement only, a Ihollow operating rod whereby the'screw may be rotated, extending back to the operators station away from the screw, an indicator rod mounted for slidable movement within an'operating rod and a connection passing through the qperatingrod between the end of the indicator rod and the nut, ,a'member in the working end of the operating rod through which the indicator rod passes, the indicator rod being provided with a series of visual indications on its end where it projects through the member so that the operator may, by inspection of the indicator rod, determine the relative position of nut and reversing screw.

16. In a valve gear for an engine, the combination of a reverse sha ft provided with independently operative arms, a reverse screw mounted radial to said shafts,

-a nut engaging said screw connected to said concentrically mounted, a member longitudinally adju'stable and radial to said shaft and permanently connected thereto in com- .b'ination with a screw for revolving said shafts in opposite directions.

- 18. A steam engine reverse gear, comprising a two part rock shaft, the two parts of which are in alinement and in rotatable engagement one with the other radius bar supporting rock a'rms one at either end of said shaft, controlling-rock arms intermediate the .ends' of said shaftadjacent "one to the other and mounted one on each .of the two parts of the shaft and means for -'ro' t'ating said arms in opposite directions to .move the radius bars.

19. 'A steam engine reverse "gear, comprising a two-part rock shaft the two parts of which are in alinement arid in rotatable envalve gear for a plurality o f each of said rock arms. and means for movsupporting rock arms one at either end of said shaft, controlling rock arms intermediate the ends of said shaft adjacent one to the other and mounted one on each of the two parts of the shaft and means-for rotating said arms in opposite directions to move the radius bars, said means comprising a reverse sleeve link connection therefrom to each of said rock arms, and means formoving said sleeve radially to and from said arm. I

20. A steam engine reverse gear, comprising a two-part rock shaft, the two parts of which are in alinement and in rotatable engag'ement one with the other, radius bar supporting rock arms one at either end of said shaft, controlling rock arms intermediate the ends of said shaft adjacent oneto the other and mounted one on each of the two parts of the shaft, means for rotating said arms in opposite directions to move the radius bars, said means comprisin a reverse sleeve, link connection there rom to each of said rock arms, and means for moving said sleeve radially to and from said arms, said means comprising a 'screw fixed against longitudinal movement, and a nut in engagement therewith rigidly fastened in said sleeve.

21. A steam'engine reverse gear, comprising a two part rock shaft, the two parts of which are in alinement and in rotatable engagement one with the other, radius bar supporting rock arms one at either end of said shaft, controlling rock arms intermediate the ends of said shaft adjacent one to the other and mounted one on each of the two parts of the shaft and means for rotating said arms in opposite directions to move the radius bars, said rock arms and operating means therefor being all mounted on a common frame.

22. A steam engine reverse gear comprising a two part rock shaft, the two parts'of which are in alinement and in rotatable engagement one with the other, radius bar supporting rock arms one at either end of said shaft, controlling rock arms intermediate the-ends of said shaft adjacent one to the other and mounted one on each of the two parts of the shaft, means for rotating said arms in opposite directions to move the radius bars, said means comprising .a reverse sleeve, link connection therefrom to ing said sleeve radially to and from said arms, said rock arm and operating means therefor being all mounted on a common frame.

23. A steam engine reverse gear, compris' ing a two part rock shaft, the twoparts of which are in alinement and in rotatable engagement one with the other, radius bar supporting rock arms one at either end of said shaft, controlling rock arms intermediate the ends of said shaft adjacent one to the other and mounted one on each of the two parts of the shaft, means for rotating said arms in opposite directions to move the radius bars, said means comprising a reverse sleeve, link connection therefrom to each of said rock arms and means for moving said sleeve radially to and from said arms, said means comprising a screw fixed against longitudinal movement, and a nut in'engagement therewith rigidly fastened in said sleeve.

24. 'A steam engine reverse gear, comprising a two part rock shaft, the two parts of which are in alinement and in rotatable engagement one with the other, radius bar supporting rock arms one at either'end of said shaft, controlling rock arms intermediate the ends of said shaft adjacent one to the other and mounted one on each of the two parts of the shaft and means for rotating said arms in opposite directions to move the radius bars, said rock arms and o erat- I ing means therefor being all mounts on a common frame, said rock arms bein located one approximately 45 above and t e other approximately 45 below the plane of the radius bars of the controlling arms when in a neutral condition.

25. A steam engine reverse gear comprising a two part rock shaft, the two parts of which are in alinement and in rotatable engagement one with the other, radius bar supporting rock arms one at either endof said shaft, controlling rock arms intermediate the ends of said shaft adjacent one to the other and mounted one on each of the two parts of-the shaft,means for rotating said arms in opposite directions to move the radius bars, said means comprising a reverse sleeve, link connection therefrom to each of said rock arms, and means for moving said sleeve radially to and from said arm, said rock arm and operating means therefor being all mounted on a common frame said rock arms being located one approximately 7 45 above and the other approximately 45 below the plane of the radius bars of the controlling arms when in a neutral condition.

26. A steam engine reverse gear comprising a two part rock shaft, the two parts of which are in alinement and in rotatable engagement one with the other, radius bar supporting rock arms one at either end of said shaft, controlling rock arms intermediate the ends of said shaft adjacent one to the other and mounted one on each of the two parts of the shaft, means for rotating said arms. in opposite directions to move the radius bars, said means comprising a. reverse sleeve,link connection therefrom to each of said rock arms and means for moving said sleeve radially to and from said arms, said means comprising a screw fixed against longitudinal movement, and a nut in engagement therewith rigidly fastened in said sleeve, said rock arms being located one approximately l5 above and the other approximately 45 below the plane of the radius bars of the controlling arms when in a neutral condition.

27. In a steam engine reverse gear a rotatable shaft for controlling the reversing movement, an indicator rod slidable within said shaft, an indicator collar upon said shaft in opposition to said indicator rod and means for moving said rod through said collar in response to the movement of the re.- versin mechanism.

28. in a steam engine reverse gear a rotatable shaft for controlling the reversing movement, an indicatoi'rod slidable within.

said shaft, an indicator collar upon said shaft in opposition to said indicator rod and means for moving said rod through said collar in response to the movement of the reversing mechanism, said means comprising a carriage on said shaft and connections therefrom to the reverse gear and a connection interposed between said'rod and shaft independent of said carriage, rod or shaft.

29. In a steam engine reverse gear a rotatable shaft for controlling the reversing movement, an indicator rod slidable within said shaft, an indicator collar upon said ing slotted through the passage of said pin longitudinally therealong, the carriage being grooved'to engage said pin and move it longitudinally in unison with the carriage independently of its rotation.

30. In a valve gear for steam engines, a reverse shaft, a frame upon which one end of said shaft is mounted, a reverse screw mounted radial to the shaft upon the frame, an arm projecting from-the shaft, a nut in engagement with-the screw, and a connection between the nut and the arm, means for rotating-the-screw to rock-the arm and a valve gear controlling arm carried by the rock shaft.

In testimony whereof, I affix my signature in the presence of two witnesses this 2nd day'of September,19l6.

OTIS YOUNG.

Witnesses MINNIE -M. LINDENAU, CHRISTINA *DEaNs. 

